There are the original mounting points like mine:
http://community.webshots.com/photo/2840056470102454676GYwdJM
These mount to the bedside as your bodyman noted. If you want two brakelights and turnsignals this is the "factory" look. There are lots of aftermarket brackets available from places like Jim Carter catalog page 66/67 Items number LGL204L and LGL204R. Also speedwaymotors.com have some.